[ash] Remove UnConfineCursor().

This code was literally unusued.

Bug: 746054
Change-Id: I65b7a748818ee074b48745c0a4f9260e8fd6c852
Reviewed-on: https://chromium-review.googlesource.com/596916Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Elliot Glaysher <erg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491430}

ash/host/ash_window_tree_host.h

@@ -34,13 +34,8 @@ class ASH_EXPORT AshWindowTreeHost {
   static std::unique_ptr<AshWindowTreeHost> Create(
       const AshWindowTreeHostInitParams& init_params);
 
-  // Clips the cursor to the bounds of the root window until UnConfineCursor().
-  // We would like to be able to confine the cursor to that window. However,
-  // currently, we do not have such functionality in X. So we just confine
-  // to the root window. This is ok because this option is currently only
-  // being used in fullscreen mode, so root_window bounds = window bounds.
+  // Clips the cursor to the bounds of the root window.
   virtual bool ConfineCursorToRootWindow() = 0;
-  virtual void UnConfineCursor() = 0;
 
   virtual void SetRootWindowTransformer(
       std::unique_ptr<RootWindowTransformer> transformer) = 0;

ash/host/ash_window_tree_host_platform.cc

@@ -48,10 +48,6 @@ bool AshWindowTreeHostPlatform::ConfineCursorToRootWindow() {
   return true;
 }
 
-void AshWindowTreeHostPlatform::UnConfineCursor() {
-  NOTIMPLEMENTED();
-}
-
 #if defined(USE_OZONE)
 void AshWindowTreeHostPlatform::SetCursorConfig(
     const display::Display& display,

ash/host/ash_window_tree_host_platform.h

@@ -26,7 +26,6 @@ class ASH_EXPORT AshWindowTreeHostPlatform
 
   // AshWindowTreeHost:
   bool ConfineCursorToRootWindow() override;
-  void UnConfineCursor() override;
   void SetRootWindowTransformer(
       std::unique_ptr<RootWindowTransformer> transformer) override;
   gfx::Insets GetHostInsets() const override;

ash/mus/ash_window_tree_host_mus.cc

@@ -36,10 +36,6 @@ bool AshWindowTreeHostMus::ConfineCursorToRootWindow() {
   return true;
 }
 
-void AshWindowTreeHostMus::UnConfineCursor() {
-  NOTIMPLEMENTED();
-}
-
 void AshWindowTreeHostMus::SetRootWindowTransformer(
     std::unique_ptr<RootWindowTransformer> transformer) {
   transformer_helper_->SetRootWindowTransformer(std::move(transformer));

ash/mus/ash_window_tree_host_mus.h

@@ -21,7 +21,6 @@ class AshWindowTreeHostMus : public AshWindowTreeHost,
 
   // AshWindowTreeHost:
   bool ConfineCursorToRootWindow() override;
-  void UnConfineCursor() override;
   void SetRootWindowTransformer(
       std::unique_ptr<RootWindowTransformer> transformer) override;
   gfx::Insets GetHostInsets() const override;

ui/aura/window_tree_host_mac.h

@@ -36,7 +36,6 @@ class AURA_EXPORT WindowTreeHostMac : public WindowTreeHost {
   void SetCapture() override;
   void ReleaseCapture() override;
   bool ConfineCursorToRootWindow() override;
-  void UnConfineCursor() override;
   void SetCursorNative(gfx::NativeCursor cursor_type) override;
   void MoveCursorToNative(const gfx::Point& location) override;
   void OnCursorVisibilityChangedNative(bool show) override;

ui/aura/window_tree_host_mac.mm

@@ -77,10 +77,6 @@ bool WindowTreeHostMac::ConfineCursorToRootWindow() {
   return false;
 }
 
-void WindowTreeHostMac::UnConfineCursor() {
-  NOTIMPLEMENTED();
-}
-
 void WindowTreeHostMac::SetCursorNative(gfx::NativeCursor cursor_type) {
   NOTIMPLEMENTED();
 }